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Re: Bug in Mathematica 7.0.1.0 ?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg109329] Re: Bug in Mathematica 7.0.1.0 ?
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Thu, 22 Apr 2010 03:30:21 -0400 (EDT)

As usual, ComplexExpand is your friend in such circumstances.

In Mathematica 7:

   ComplexExpand[Conjugate[a b], b, TargetFunctions -> Conjugate]
a Conjugate[b]

Without the TargetFunctions option:

   ComplexExpand[Conjugate[a b], b]
-I a Im[b] + a Re[b]

On 4/21/2010 4:30 AM, slawek wrote:
> In[1] := Im[a] ^= 0; Conjugate[a b]
>
> Out[1] := Conjugate[a b]
>
> It is not funny, Mathematica 6 properly evaluates the result
>
> a Conjugate[b]
>
> What happens?
>
> slawek
>
>

-- 
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
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Amherst, MA 01003-9305


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